Design Of Full-mode Applicator And Research On Its Dynamic Characteristics

In the field of rehabilitation therapy and sports fitness,myodynamia assessment is a basic link,rehabilitation and training plan based on,to evaluate accurately muscle strength of patients and athletes,for whom,myodynamia training efficiency is of vital importance.In addition,muscle weakness issue of senior citizens need practical concerns.And scientific and efficient training methods are needed in national fitness campaign.The existing myodynamia assessment and training equipment is mainly monopolized by foreign company.And the price and maintenance fees of the equipments are so expensive that few central hospital and research institutations can afford.And the cost per use remains high.So it is of research significance to develop full-mode applicator which can evaluate and train muscle strength and has lower cost,which leads to an extensive prospect.The principle of myodynamia assessment and training is studied intensively to provide medical physiology theoretical basis for the full-mode applicator design,functional requirement and performance parameters.According to these functions and parameters,realization ways of full-mode applicator are discussed and AC servo motor is taken as actuator.The principle of servo motor control and performance parameters adjustment is studied intensively to provide theoretical basis for the full-mode applicator control algorithm design.Further more,a full-mode applicator is built to realize isotonic train,isometric train,passive train and isokinetic train,which consists of PLC as the upper machine controlling servo drive and servo motor,torque sensor as the feedback element detecting real-time torque and the touch screen realizing man-machine interaction.The PLC program algorithm is designed to deal with machine torque and speed fluctuation.Tests are done by using PLC date logging,and the results indicate that it is feasible to take AC sevor motor as the actuator of full-mode applicator.In order to take further test and to improve the performance of the full-mode applicator,a test-bed for applicator is built,which can output torque and speed having a specific relationship with time to simulate subject's torque output and speed output in practical use and can simulate various auxiliary connection accessories by modulating rotational inertia,friction resistance and elastic modulus.By testing four training modes,more performance parameters are acquired,some of which can be improved by adjusting sevor motor respond.These tests indicate that the full-mode applicator is of maturity function and fine user experience and its parameters meet the requirements.